Ah, that explains it with the lack of game revenue then, although I don't think there's a problem with allowing donations because even with jam games someone might appreciate them enough to want to offer a small token of support.
There is a South African dev collective that used to release all its games for free and it made a small amount with donations (I'm probably not at liberty to say how much). They then decided to charge for all the games, which also coincided with some bigger project releases, and I've been meaning to ask how that changed payment behaviour and if it helped but the pandemic got in the way so I have yet to ask the question.
Thanks for your kind words about Heist At The Museum. I'm particularly proud of that one, not just because it was my first Bitsy game, but because even with the jam rush it still worked out quite well, miraculously. I only watched the John Oliver segment about museums a few weeks ago and was amazed at how close it was to what I put in the game. Clearly I have assimilated the nuances of the issue quite well over the years, probably because I'm from a country whose objects (and people) have been stolen by multiple countries.